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Unformatted text preview: PHYS 110 d_~\e: 9))~Y!./~ Q.8 Q& ,.' In the previous question, the coefficient of kinetic friction ).lk is: (a) 0.3 (b) 0.12 (c) 0.58 (d) 1.7 (e) Zero (f) 0.08 0,.7 A ball shot up making an angle 8 with the horizontal, with a speed of 30 m/s. The time that the object needs to reach its maximum range is: (a)4.3s (b)3.1s (c) 42.4 s (d)0.41s (e)6.1s (f)129.9s A stone is thrown up with a speed of 20 m/s making an angle 45° with the horizontal. The height of the stone at half the range is: (a) 199.6 m (b) 99.8 m (c) 20.4 m (d) 10.21 m (e) 203.8 m (f) 40 m Q.9 A ball was projected upward at angle 8 0 with the horizontal and an initial speed of 50 m/s. The ball reached the highest point after three seconds, the angle 8 0 is: (a) 11.3° (b) 34.4° (c) 36° (d) 60° (e) 5.7° (f) 30° Q.10 In the figure two blocks are connected and bulled to the right on a horizontal frictionless table by a force with a magnitude of 84 N. If the mass m1 = 8 kg and m2 =13 kg , the acceleratiof"! of the system is: T 1____. .. F (a) 3 m/s2 (b) 4 m/s2 (c) 5 m/s2 (d) 6 m/s2 (e) 7 m/s2 (f) 2 m/s2 Q.11 Twoforcesactonaparticleofmass2kg. ~ =(80l+60})N and ~ =(401+100j)N The magnitude of the acceleration is: (a) 25 m/s 2 (b) 50 m/s2 (c) 100 m/s2 (d) 200 m/s2 (e) 400 m/s2 (f) 10 m/s2 Q.12 In the figure, the normal force on the mass is: F=10 N (a) 39.2 N (b) 4.2 N (c) 42.4 N (d) 46.7 N (e) Zero (f) iON Q.1 1/5 A 5 kg box is pushed up a rough surface j.lk=0.5 inclined at 30° to the horizontal by a horizontal force of magnitude of 100 N. a) The Normal force is: (a) 42.4 N (b) 92.4 N (c) 86.6 N (d) Zero (e) 100 N b) The frictional force is: (a) 50 N (b) 100 N (c) Zero (d) 109.87 N (e) 46.2 N c) The acceleration of the box is: (a) 3.18 m/s 2 (b) 9.8 m/s2 (c) 1.58 m/s 2 (d) Zero (e) 8 m/s 2 d) If the acceleration is equal to zero, the pushing force is: (a) 100 N (b) 81.6 N (c) Zero (d) 50 N (~) 86.6 N Q.2 In the figure (1), the mass m of the block is 3 kg rests on a frictionless surface, the force F is 10 N 6=30° and cP=15°. The magnitude of the acceleration of the block is: F . Fig. (1) ,." (a) 1.3 m/s2 (b) 0.7 m/s2 (c) 1.04 m/s 2 (d) 2.9 m/s 2 (e) 4.5 ~/S2 (f) 1.68 m/s2 In the figure (1) the magnitude of the normal force exerted outward on the block by the plane on which on which it rests is: (a) 9.7 N (b) 3 N (c) 22.87 N (d) 25.5 N (e) Zero (f) 2.59 N A 4 kg block is sliding on a frictionless plane inclined at 6=20°. The magnitude of the acceleration of the block is: (a) 3.35 m/s2 (b) 9.8 m/s2 (c) 16.76 m/s2 (d) 4.9 m/s2 (e) 9.2 m/s2 (f) Zero . In the figure (2) a crate of mass m1=12 kg moves along a plane that makes an angle of 6=30° with the horizontal, That crate is connected to a crate of mass m2= 12 kg by a taut, massless cord. The hang crate descends with constant velocity. The magnitude of the frictional force exerted on m1 by . the plane is: Rough Fig.(2) suface \ 8 (a) 24 N (b) 12 N (c)29.7N (d) 117.6 N (e) Zero (f) 58.8 N Q.14 Q.15 In the figure a block B of unknown mass M hangs by a cord from the...
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 Spring '10
 DR
 Physics, Friction, initial speed

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